PDF malware analysis — malicious · 7b7c43bf46a2d1fa

MALICIOUS

PDF

4.7 KB Authoring application: Majekizihax i

MD5: 259c8a6e82314c7681ff519b7cb9d10a SHA-1: a9ad0a8883edddaa6522e31feef9a40aa85168b8 SHA-256: 7b7c43bf46a2d1fa4881bd33ae791f41baddec4090193241b1770c0ba871962f

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript that is obfuscated but appears to be a stager. The script reconstructs a string, likely a URL or command, which is then executed. This behavior is consistent with a downloader or dropper, aiming to fetch and run a secondary malicious payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `fd2783f45327cfae5100a8729abbd004704ec6540b47a60551b69499fea54167`	pdf-javascript-stream	PDF /JS object 11 at offset 0xD71	903 bytes

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